US20120108165A1 - Wireless communication system, base station, relay station, and wireless communication method - Google Patents

Wireless communication system, base station, relay station, and wireless communication method Download PDF

Info

Publication number
US20120108165A1
US20120108165A1 US13/344,754 US201213344754A US2012108165A1 US 20120108165 A1 US20120108165 A1 US 20120108165A1 US 201213344754 A US201213344754 A US 201213344754A US 2012108165 A1 US2012108165 A1 US 2012108165A1
Authority
US
United States
Prior art keywords
bands
amplification
base station
sub
mobile stations
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US13/344,754
Other languages
English (en)
Inventor
Toshiro Sawamoto
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fujitsu Ltd
Original Assignee
Fujitsu Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fujitsu Ltd filed Critical Fujitsu Ltd
Assigned to FUJITSU LIMITED reassignment FUJITSU LIMITED ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: SAWAMOTO, TOSHIRO
Publication of US20120108165A1 publication Critical patent/US20120108165A1/en
Abandoned legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/52—TPC using AGC [Automatic Gain Control] circuits or amplifiers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/24—Cell structures
    • H04W16/26—Cell enhancers or enhancement, e.g. for tunnels, building shadow
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/155—Ground-based stations
    • H04B7/15528—Control of operation parameters of a relay station to exploit the physical medium
    • H04B7/15535—Control of relay amplifier gain
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/04—Large scale networks; Deep hierarchical networks
    • H04W84/042—Public Land Mobile systems, e.g. cellular systems
    • H04W84/047—Public Land Mobile systems, e.g. cellular systems using dedicated repeater stations

Definitions

  • the embodiments discussed herein are related to a wireless communication system, a base station, a relay station, and a wireless communication method.
  • a relay station is conventionally used in wireless communication systems.
  • Relay stations include non-regenerating types that amplify and transmit received signals, and regenerating types that amplify and transmit received signals after first decoding the signal and regenerating the original data.
  • a system is known that can determine communication paths capable of realizing high speed communication by multi-hop.
  • a mobile communication system includes a communication path determining unit that based on the interference level of the signals respectively received by a relay station and a base station, which form a communication path between communicating stations, determines a communication path that offers the fastest communication speed or that satisfies a specified line quality (see, for example, International Publication Pamphlet No. 2003/101132).
  • a wireless communication system includes a calculator that calculates the number of mobile stations for which amplification is to be performed or the rate of mobile stations for which amplification is to be performed among all mobile stations; an allocator that based on a calculation result obtained by the calculator, allocates from among a plurality of bands, one or more bands for performing amplification; and an amplifier that performs amplification with respect to the one or more bands allocated by the allocator.
  • the calculator is included at a base station and the allocator and the amplifier are included at a relay station, or the calculator and the allocator are included at the base station and the amplifier is included at the relay station.
  • FIG. 1 is a block diagram of a wireless communication system according to a first embodiment.
  • FIG. 2 is a flowchart of the wireless communication method according to the first embodiment.
  • FIGS. 3 and 4 are block diagrams of examples of the wireless communication system according to the first embodiment.
  • FIG. 5 is a block diagram of a base station according to a second embodiment.
  • FIG. 6 is a block diagram of a relay station according to the second embodiment.
  • FIG. 7 is a schematic of an example of a table.
  • FIG. 8 is a flowchart of dynamic allocation in the wireless communication method according to the second embodiment.
  • FIG. 9 is a flowchart of random allocation in the wireless communication method according to the second embodiment.
  • FIG. 10 is a block diagram of the base station according to a third embodiment.
  • FIG. 11 is a block diagram of the relay station according to the third embodiment.
  • FIG. 12 is a flowchart of the wireless communication method according to the third embodiment.
  • FIG. 13 is a block diagram of the base station according to a fourth embodiment.
  • FIG. 14 is a block diagram of the relay station according to the fourth embodiment.
  • FIG. 15 is a flowchart of the wireless communication method according to the fourth embodiment.
  • FIG. 16 is a block diagram of the base station according to a fifth embodiment.
  • FIG. 17 is a flowchart of the wireless communication method according to the fifth embodiment.
  • FIG. 18 is a block diagram of the base station according to a sixth embodiment.
  • FIG. 19 is a flowchart of the wireless communication method according to the sixth embodiment.
  • FIG. 20 is a block diagram of the base station according to a seventh embodiment.
  • FIG. 21 is a flowchart of the wireless communication method according to the seventh embodiment.
  • a base station calculates the number of mobile stations whose signals require amplification at a relay station or the rate of mobile stations whose signals require amplification among all of the mobile station within the cell.
  • the number of mobile stations whose signals require amplification at a relay station, or the rate of mobile stations whose signals require amplification among all of the mobile station within the cell is simplified as “the number of or the rate of mobile stations requiring amplification”.
  • the relay station based on the number of or the rate of mobile stations requiring amplification, performs amplification with respect to one or more bands among multiple bands.
  • FIG. 1 is a block diagram of the wireless communication system according to a first embodiment.
  • the wireless communication system includes a base station 1 and a relay station 2 .
  • the base station 1 includes a calculator 3 that calculates the number of or the rate of mobile stations 6 requiring amplification.
  • the relay station 2 for example, includes an allocator 4 and an amplifier 5 .
  • the allocator 4 based on calculation results obtained by the calculator 3 , allocates one or more bands for performing amplification.
  • the amplifier 5 performs amplification with respect to the bands allocated by the allocator 4 . Configuration may be such that the allocator 4 is included at the base station 1 .
  • the number of the relay stations 2 and/or the number of the mobile stations 6 may be plural.
  • FIG. 2 is a flowchart of the wireless communication method according to the first embodiment.
  • the base station calculates the number of or the rate of mobile stations requiring amplification (step S 1 ).
  • the relay station based on the calculations results at step S 1 , allocates one or more bands for performing amplification (step S 2 ). Subsequently, the relay station performs amplification with respect to the bands allocated at step S 2 (step S 3 ). If the allocator is included at the base station, step S 2 is performed at the base station.
  • FIGS. 3 and 4 are block diagrams of examples of the wireless communication system according to the first embodiment.
  • the wireless communication system includes the base station 1 and, one or more relay stations (in the example depicted, for example, relay stations A 2 a and B 2 b ). Further, one or more mobile stations (in the example depicted, for example, mobile stations A 6 a , B 6 b , C 6 c ) are present in the wireless communication system.
  • the base station 1 determines whether the wireless signals communicated with the mobile stations 6 a , 6 b , 6 c require amplification, based on the reception state of the wireless signals transmitted from each of the mobile stations 6 a , 6 b , and 6 c .
  • the width of the arrows indicating wireless communication links between the base station 1 and each of the mobile stations 6 a , 6 b , 6 c indicate the reception state of the wireless signal at the base station 1 , where the wider the arrow, the better the reception state is.
  • the base station 1 determines that amplification of wireless signals to and from mobile station A 6 a and mobile station C 6 c do not require amplification.
  • the base station 1 determines that wireless signals to and from mobile station B 6 b require amplification. Therefore, in the depicted example, the number of mobile stations for which amplification is required is one and the rate of mobile stations requiring amplification is 1 ⁇ 3.
  • the base station 1 notifies each of the relay stations 2 a , 2 b of the number of or the rate of mobile stations requiring amplification.
  • the relay stations 2 a , 2 b based on the number of or the rate of mobile stations requiring amplification, allocated one or more bands for performing amplification.
  • the base station 1 may allocate one or more bands for performing amplification and further provide the relay stations 2 a , 2 b with information related to the allocation.
  • the relay stations 2 a , 2 b perform amplification with respect to the allocated bands.
  • the number of relay stations may be one or, three or more.
  • the number of mobile stations may be one, two or, four or more.
  • the relay station since the relay station performs amplification with respect to one or more of the bands, based on the number of or the rate of mobile stations requiring amplification, necessary and sufficient amplification can be performed according to the number of or the rate of mobile stations requiring amplification.
  • configuration can be such that the relay station does not perform amplification with respect to more bands than is necessary. Therefore, compared to a case where amplification is performed at a constant gain with respect to all of the bands, the relay station can be prevented from becoming a source of interference.
  • the entire active band of the wireless communication system is, for example, divided into sub-bands.
  • the active band is, for example, 20 MHz.
  • LTE-Advanced which is an expansion of LTE
  • active band on the order of 100 MHz is under investigation.
  • making the active band of LTE-Advanced systems a multiple (e.g., 5) of the active band of LTE systems is under investigation.
  • active band on the order of 100 MHz would be divided among five 20 MHz-sub-bands.
  • the second embodiment is applicable to such an LTE-Advanced system.
  • an example of application to an LTE-Advanced system will be described.
  • the base station calculates the number of or the rate of mobile stations requiring amplification. Based on the number of or the rate of mobile stations requiring amplification as calculated by the base station, the relay station, from among the sub-bands, allocates one or more sub-bands for performing amplification. The relay station amplifies input signals of the sub-bands allocated for performing amplification.
  • FIG. 5 is a block diagram of the base station according to the second embodiment.
  • the base station 11 includes a measurer 12 , a table 13 , a determiner 14 , and a calculator 15 .
  • the base station 11 receives, via an antenna 16 and a switch 17 , wireless signals transmitted from a non-depicted mobile station.
  • the measurer 12 measures the reception quality of mobile stations within the cell.
  • Signal to interference power rate (SIR) may be given as one example of reception quality.
  • Table 13 stores thresholds used when the reception quality of a mobile station is determined.
  • the determiner 14 compares mobile station reception quality and a threshold.
  • the determiner 14 determines that amplification is not necessary for a mobile station whose reception quality is equal to or exceeds the threshold.
  • the determiner 14 determines that amplification is necessary for a mobile station whose reception quality does not exceed the threshold.
  • the calculator 15 based on the determination results obtained by the determiner 14 , calculates the number of or the rate of mobile stations requiring amplification.
  • the base station 11 via the switch 17 and the antenna 16 , gives notification of (broadcasts) the number of or the rate of mobile stations requiring amplification as calculated by the calculator 15 .
  • the antenna 16 , the switch 17 , the measurer 12 , table 13 , the determiner 14 , and the calculator 15 for example, operate as the calculator 3 in the first embodiment.
  • FIG. 6 is a block diagram of the relay station according to the second embodiment.
  • FIG. 7 is a schematic of an example of the table.
  • a relay station 21 is, for example, a non-regenerating type relay station and includes a first receiver 22 , a table 23 , a calculator 24 , a second receiver 25 , an allocator 26 , a notifier 27 , and an amplifier 28 .
  • the relay station 21 via an antenna 29 , receives wireless signals from a non-depicted base station or mobile station.
  • the first receiver 22 receives and stores the number of or the rate of mobiles stations requiring amplification broadcasted by the base station.
  • Table 23 stores correspondence relationships between the number of or the rate of mobile stations requiring amplification and the number of amplifying sub-bands (see FIG. 7 ). Correspondence relationships between the number of or the rate of mobile stations requiring amplification and the number of amplifying sub-bands may be, for example, preliminarily obtained by simulation using a computing device.
  • N 0 , N 1 , N 2 , and N 3 are the number of or the rate of mobile stations requiring amplification and have a magnitude relationship of N 0 ⁇ N 1 ⁇ N 2 ⁇ N 3 , for example.
  • a, b, and c are the number of amplifying sub-bands and have a magnitude relationship of a ⁇ b ⁇ c, for example.
  • the calculator 24 calculates the number of amplifying sub-bands.
  • the second receiver 25 receives and stores information provided by other non-depicted relay stations.
  • the information provided by the other relay stations for example, includes information indicating the sub-bands of signals subject to amplification by the respective relay stations.
  • the allocator 26 based on the number of amplifying sub-bands calculated by the calculator 24 , allocates from among the sub-bands, sub-bands of the number calculated by the calculator 24 .
  • a dynamic allocation method and a random allocation method may be given as examples of the sub-band allocation method.
  • the dynamic allocation method is an allocation method of allocating, as sub-bands for performing amplification, sub-bands that are not in-use.
  • the sub-bands are allocated based on, for example, information that is received by the second receiver 25 and that indicates the sub-bands of signals subject to amplification by other relay stations.
  • the dynamic allocation method can prevent the relay stations in the cell of the base station and the relay stations in a neighboring cell from amplifying signals of the same sub-bands, thereby preventing interference from occurring.
  • the random allocation method is a method of allocating, as sub-bands for performing amplification, an arbitrary sub-band, without referring to information indicating the sub-bands of signals subject to amplification by other relay stations.
  • the random allocation method facilitates processing at the relay device since the sharing of information indicating the sub-bands of signals subject to amplification does not need to be shared among the relay stations.
  • the allocation method of the relay station 21 may be fixed as either one of the allocation methods according to the environment where the relay station 21 is installed. If the allocation method of the relay station 21 is fixed as the random allocation method, the second receiver 25 and the notifier 27 described hereinafter do not operate. Therefore, if the allocation method of the relay station 21 is fixed as the random allocation method, the second receiver 25 and the notifier 27 may be omitted.
  • the notifier 27 provides to other relay stations and via an antenna 30 , information indicating the sub-bands allocated by the allocator 26 , i.e., information indicating the sub-bands of the signals subject to amplification at the relay station 21 .
  • the amplifier 28 amplifies analog input signals of the sub-bands allocated by the allocator 26 .
  • the amplified signal is transmitted via the antenna 30 .
  • the antenna 29 , the first receiver 22 , table 23 , the calculator 24 , the second receiver 25 , and the allocator 26 for example, operate as the allocator 4 in the first embodiment.
  • the amplifier 28 for example, operates as the amplifier 5 in the first embodiment.
  • FIG. 8 is a flowchart of dynamic allocation in the wireless communication method according to the second embodiment.
  • the base station measures the reception quality between the base station and mobile stations, such as the SIR of the mobile stations (step S 11 ).
  • the base station compares the reception quality of the mobile stations and a preliminarily set threshold; and for example, for a mobile station whose reception quality does not exceed the threshold, determines that the mobile station requires amplification.
  • the base station based on determination results concerning the need for amplification, calculates the number of or the rate of mobile stations requiring amplification and broadcasts the number of or the rate of mobile stations requiring amplification (step S 12 ).
  • the relay station receives the number of or the rate of mobile stations requiring amplification broadcasted by the base station; and based on the number of or the rate of mobile stations requiring amplification and the correspondence relationship of the number of or the rate of mobile stations requiring amplification and the number of amplifying sub-bands, the relay station determines the number of amplifying sub-bands (step S 13 ).
  • the relay station further receives information that is provided by other relay stations and that indicates the sub-bands of signals subject to amplification by the other relay stations (step S 14 ).
  • the relay station based on the number of amplifying sub-bands determined at step S 13 and the information received at step S 14 and indicating the sub-bands of signals subject to amplification by the other relay stations, allocates as sub-bands for performing amplification, sub-bands of the number determined at step S 13 .
  • the relay station dynamically allocates the amplifying sub-bands (step S 15 ).
  • the relay station provides to the other relay stations, information indicating the amplifying sub-bands allocated at step S 15 (step S 16 ).
  • the relay station further amplifies analog input signals of the sub-bands allocated at step S 15 .
  • the execution timing of step S 14 may be before or after step S 13 .
  • FIG. 9 is a flowchart of random allocation in the wireless communication method according to the second embodiment.
  • the base station measures mobile station reception quality (step S 21 ) and broadcasts the number of or the rate of mobile stations requiring amplification (step S 22 ).
  • the relay station determines the number of amplifying sub-bands (step S 23 ). Based on the number of amplifying sub-bands determined at step S 23 , the relay station, from among the sub-bands, randomly allocates sub-bands of the number determined at step S 23 (step S 24 ). Subsequently, the relay station amplifies analog input signals of the sub-bands allocated at step S 24 .
  • a scheduler provided at the base station allocates wireless resources of a mobile station, whose reception quality is poor, to sub-bands for which the reception quality has been improved by amplification at a relay station, whereby the reception quality of the mobile station having poor reception quality can be improved.
  • a regenerating type relay station may be used.
  • the entire active band of the wireless communication system is, for example, divided into sub-bands.
  • the base station calculates the number of or the rate of mobile stations requiring amplification and based on the calculation results, allocates from among the sub-bands, one or more sub-bands for performing amplification.
  • the relay station amplifies input signals of the sub-bands allocated by the base station.
  • FIG. 10 is a block diagram of the base station according to the third embodiment.
  • a base station 31 includes the measurer 12 , a first table 32 , the determiner 14 , a first calculator 33 , a second table 34 , a second calculator 35 , a transceiver 36 , and an allocator 37 .
  • the first table 32 and the first calculator 33 are respectively similar to the table 13 and the calculator 15 of the base station 11 in the second embodiment.
  • the second table 34 is similar to table 23 of the relay station 21 in the second embodiment.
  • the second calculator 35 calculates the number of amplifying sub-bands, based on the number of or the rate of mobile stations requiring amplification as calculated by the first calculator 33 and correspondence relationships stored in the second table 34 .
  • the transceiver 36 transmits to other base stations, information indicating the sub-bands of signals that are subject to amplification by relay stations within the cell of the base station 31 .
  • the transceiver 36 receives and stores information that is from other base stations and that indicates the sub-bands of signals that are subject to amplification by the relay stations in the cells of the other base stations.
  • the base stations exchange information through a line for communicating control information.
  • An X2 Control Plane Interface may be given as an example of the line for communicating control information.
  • the allocator 37 from among the sub-bands, randomly allocates sub-bands of the number calculated by the second calculator 35 . Further, the allocator 37 , based on the information received by the transceiver 36 and indicating the sub-bands of signals that are subject to amplification by other relay stations, dynamically allocates from among the sub-bands, sub-bands of the number calculated by the second calculator 35 . In the case of dynamic allocation, the allocator 37 may allocate from among the sub-bands and in a given order such as descending order of frequency, the sub-bands of signals that are not subject to amplification by the relay station (available sub-bands).
  • the base station 31 via the switch 17 and the antenna 16 , broadcasts information indicating the sub-bands allocated by the allocator 37 .
  • Other aspects of the configuration of the base station 31 are similar to those of the second embodiment.
  • the antenna 16 , the switch 17 , the measurer 12 , the first table 32 , the determiner 14 , and the first calculator 33 for example, operate as the calculator 3 in the first embodiment.
  • the second table 34 , the second calculator 35 , the transceiver 36 , and the allocator 37 for example, operate as the allocator 4 in the first embodiment.
  • FIG. 11 is a block diagram of the relay station according to the third embodiment.
  • a relay station 41 is, for example, a non-regenerating type relay station and includes a receiver 42 , a notifier 43 , and the amplifier 28 .
  • the receiver 42 receives and stores information that is broadcasted by the base station and that indicates the sub-bands allocated for performing amplification.
  • the notifier 43 based on the information received by the receiver 42 and indicating the sub-bands allocated for performing amplification, notifies the amplifier 28 of allocated sub-bands.
  • the amplifier 28 amplifies analog input signals of the allocated sub-bands indicated by the notifier 43 .
  • Other aspects of the configuration of the relay station 41 are similar to those of the second embodiment.
  • the antenna 29 , the receiver 42 , the notifier 43 , and the amplifier 28 for example, operate as the amplifier 5 in the first embodiment.
  • FIG. 12 is a flowchart of the wireless communication method according to the third embodiment.
  • the base station measures mobile station reception quality (step S 31 ) and calculates the number of or the rate of mobile stations requiring amplification (step S 32 ).
  • the base station does not broadcast the number of or the rate of mobile stations requiring amplification.
  • the base station determines the number of amplifying sub-bands (step S 33 ).
  • the base station extracts the sub-bands of signals that are subject to amplification by relay stations within the areas of other base stations (step S 34 ).
  • the base station determines whether there is a sub-band for which amplification can be performed, i.e., a sub-band of signals that are not being amplified by another relay station (an available sub-band) (step S 35 ). If there is a sub-band for which amplification can be performed (step S 35 : YES), the base station allocates the sub-band for performing amplification (step S 36 ).
  • the base station may allocate available sub-bands according to a given order, such as in descending order of frequency.
  • step S 35 If there is no sub-band for which amplification can be performed (step S 35 : NO), the base station randomly allocates a sub-band for performing amplification (step S 37 ). Random allocation of a sub-band for performing amplification lowers the possibility of the same sub-band being allocated by relay stations within a range of interacting with one another, whereby interference can be prevented from occurring.
  • the base station When allocation of the sub-band ends, the base station provides to other base stations, information indicating the sub-bands allocated for performing amplification (step S 38 ). The base station further broadcasts the information indicating the sub-bands allocated for performing amplification (step S 39 ). The relay station receives the information that is provided by base station and that indicates the sub-bands allocated for performing amplification, and amplifies analog input signals of the allocated sub-bands (step S 40 ).
  • the execution timing of step S 34 may be before or after step S 33 , before step S 32 , or before step S 31 .
  • the execution timing of step S 38 may be before or after step S 39 , or after step S 40 .
  • the reception quality of a mobile station having poor reception quality can be improved.
  • a regenerating type relay station may be used.
  • the allocation method of the base station may be fixed to the random method of allocating sub-bands.
  • the transceiver 36 which performs communication, may be omitted.
  • steps S 34 to S 36 and step S 38 in the flowchart depicted in FIG. 12 may be omitted.
  • the relay station of the third embodiment has information related to the mobile stations for which the relay station is to perform amplification.
  • the relay station allocates sub-bands of a number corresponding to the number of mobile stations included in both information related to the mobile stations for which amplification is to be performed by the relay station and information related to mobile stations selected by the base station, as mobile station for which amplification is to be performed.
  • the allocator 37 randomly allocates for performing amplification, sub-bands of the number calculated by the second calculator 35 and broadcasts, via the switch 17 and the antenna 16 , information indicating the sub-bands allocated for performing amplification.
  • Other aspects of the configuration of the base station 51 are similar to the third embodiment.
  • the first determiner 64 compares mobile station reception quality and a threshold. In general, the closer the mobile station is to the relay station, the better the reception quality is for the mobile station.
  • the first determiner 64 for example, with respect to a mobile station whose reception quality exceeds the threshold, determines that the mobile station is nearby.
  • a mobile station that has been determined to be nearby is a mobile station candidate for which amplification is to be performed by the relay station.
  • the first determiner 64 for example, with respect to a mobile station whose reception quality does not exceed the threshold, determines that the mobile station is not nearby.
  • a mobile station that has been determined to not be nearby is not a mobile station candidate for which amplification is to be performed by the relay station.
  • the generator 65 based on the determination result obtained by the first determiner 64 , generates a list of mobile station candidates for which amplification is to be performed by the relay station.
  • the second determiner 68 determines all of the sub-bands allocated by the base station to be sub-bands for actually performing amplification at the relay station.
  • the second determiner 68 determines sub-bands of a number corresponding to the number of the mobile stations (for which amplification has been determined necessary by the base station) included in the mobile station candidate list of the relay station, to be sub-bands for actually performing amplification.
  • the second determiner 68 may, for example, randomly eliminate from among all of the sub-bands allocated by the base station, sub-bands of a number corresponding to the number of mobile stations for which amplification is not to be performed at the relay station. Correspondence relationships between the number of mobile stations for which amplification is to be performed at the relay station and the number of sub-bands to be eliminated may be preliminarily obtained, for example, by simulation using a computing device.
  • the antenna 29 , the measurer 62 , the table 63 , the first determiner 64 , the generator 65 , the first receiver 66 , the second receiver 67 , the second determiner 68 , and the amplifier 28 for example, operate as the amplifier 5 in the first embodiment.
  • FIG. 15 is a flowchart of the wireless communication method according to the fourth embodiment.
  • the base station measures mobile station reception quality (step S 41 ), calculates the number of or the rate of mobile stations requiring amplification (step S 42 ), and determines the number of amplifying sub-bands (step S 43 ).
  • the base station broadcasts the number of amplifying sub-bands and information related to the mobile stations for which amplification has been determined to be necessary (step S 44 ).
  • the relay station measures the reception quality between the relay station and mobile stations, such as the SIR of the mobile stations.
  • the relay station compares the reception quality of each mobile station with a predetermined threshold; and for example, for a mobile station whose reception quality exceeds the threshold, determines that the mobile station is nearby.
  • the relay station creates a list of mobile stations that have been determined to be nearby (step S 45 ).
  • the relay station determines whether all of the mobile stations for which amplification has been determined to be necessary by the base station are included in the mobile station candidate list of the relay station (step S 46 ). If all of the mobile stations are included in the mobile station candidate list of the relay station (step S 46 : YES), the relay station performs amplification with respect to all of the sub-bands allocated by the base station, for performing amplification (step S 47 ).
  • step S 46 If a portion of the mobile stations for which amplification has been determined necessary by the base station are included in the mobile station candidate list of the relay station (step S 46 : NO, step S 48 : YES), the relay station performs amplification with respect to sub-bands of a number that corresponds to the number of the mobile stations for which amplification has been determined to be necessary by the base station, included in the mobile station candidate list of the relay station (step S 49 ).
  • step S 48 NO
  • the relay station does not perform amplification with respect to any of the sub-bands allocated by the base station (step S 50 ).
  • the execution timing of step S 45 may be before or after step S 44 , before step S 43 , before step S 42 , or before step S 41 .
  • the relay station performs amplification with respect to sub-bands of a number corresponding to the number of mobile stations for which amplification has been determined necessary by the base station, included in the mobile station candidate list of the relay station
  • configuration can be such that the relay station does not perform amplification with respect to sub-bands of a number corresponding to the mobile stations not included in the mobile station candidate list of the relay station. Therefore, the relay station can be prevented from becoming a source of interference.
  • the reception quality of a mobile station whose reception quality is poor can be improved.
  • a regenerating type relay station may be used.
  • the base station of the third embodiment allocates, based on the inner-cell interference power of each sub-band, one or more sub-bands for performing amplification.
  • the configuration of the base station in the fifth embodiment is, for example, as depicted in FIG. 16 .
  • the configuration of the relay station in the fifth embodiment is similar to the relay station in the third embodiment.
  • FIG. 16 is a block diagram of the base station according to the fifth embodiment.
  • a base station 71 includes a first measurer 72 , the first table 32 , the determiner 14 , the first calculator 33 , the second table 34 , the second calculator 35 , the transceiver 36 , the allocator 37 , a second measurer 73 , a third table 74 , and a third calculator 75 .
  • the first measurer 72 is similar to the measurer 12 of the third embodiment.
  • the second measurer 73 measures interference power in the cell for each sub-band.
  • the third table 74 stores thresholds used for determining based on sub-band inner-cell interference power, whether to perform amplification. Relationships between sub-band inner-cell interference power and the determination-use thresholds may be, for example, preliminarily obtained by simulation using a computing device.
  • the third calculator 75 determines the sub-bands for which amplification can be performed at the relay station.
  • the third calculator 75 determines sub-bands having an interference power that is less than or equal to the threshold to be sub-bands for which amplification can be performed at the relay station.
  • the third calculator 75 determines sub-bands having an interference power that exceeds the threshold to be sub-bands for which amplification cannot be performed at the relay station.
  • the allocator 37 based on information received by the transceiver 36 and indicating the sub-bands for which amplification is being performed at the relay station, obtains the sub-bands for which the relay station is not performing amplification (available sub-bands). The allocator 37 , from among the available sub-bands, extracts the sub-bands for which amplification can be performed at the relay station as determined by the third calculator 75 . The allocator 37 , from among the extracted sub-bands, in a given order (e.g., in descending order of interference power), allocates for performing amplification, sub-bands corresponding in number to that calculated by the second calculator 35 .
  • a given order e.g., in descending order of interference power
  • the allocator 37 from among the extracted sub-bands, allocates arbitrary sub-bands corresponding in number of that calculated by the second calculator 35 .
  • the allocator 37 allocates all of the sub-bands for which amplification can be performed at the relay station.
  • Other aspects of the configuration of the base station 71 are similar to those of the third embodiment.
  • the antenna 16 , the switch 17 , the first measurer 72 , the first table 32 , the determiner 14 , and the first calculator 33 for example, operate as the calculator 3 in the first embodiment.
  • the second table 34 , the second calculator 35 , the transceiver 36 , the allocator 37 , the second measurer 73 , the third table 74 , and the third calculator 75 for example, operate as the allocator 4 in the first embodiment.
  • FIG. 17 is a flowchart of the wireless communication method according to the fifth embodiment.
  • the base station calculates the number of or the rate of mobile stations requiring amplification (step S 51 ), and calculates the number of amplifying sub-bands k (where, k is a whole number, 0 or greater) (step S 52 ).
  • the base station calculates the number of sub-bands m (where, m is a whole number, 0 or greater) having an inner-cell interference power that is less than or equal to the threshold (step S 53 ).
  • the base station based on information indicating the sub-bands of signals subject to amplification by relay stations in the areas of other base stations, extracts sub-bands (available sub-bands) for which amplification is not being performed by the other relay stations (step S 54 ).
  • the base station among the available sub-bands, for example, allocates the sub-band having lowest interference power to be a sub-band for performing amplification (step S 55 ).
  • the base station decrements k and m by 1, respectively (step S 56 ).
  • the base station determines whether the resulting value of k is 0 (step S 57 ). If the value of k is 0 (step S 57 : YES), there are no more amplifying sub-bands and consequently, the base station ends the allocation process. If the value of k is not 0 (step S 57 : NO), the base station determines whether the value of m is 0 (step S 58 ). If the value of m is 0 (step S 58 : YES), there are no more sub-bands having an inner-cell interference power that is less than or equal to the threshold and consequently, the base station ends the allocation process. If the value of m is not 0 (step S 58 : NO), the base station returns to step S 55 , at which time, for example, the base station allocates the sub-band having the lowest interference power (step S 55 ).
  • Steps S 55 to S 58 are repeated until there are no more amplifying sub-bands or until there are no more sub-bands having an inner-cell interference power that is less than or equal to the threshold.
  • the execution timing of step S 53 may be before or after step S 52 , or before step S 51 .
  • the execution timing of step S 54 may be before or after step S 53 , before step S 52 , or before step S 51 .
  • the processes performed at the base station and the relay station, respectively, after sub-bands have been allocated by the base station are similar to those of the third embodiment.
  • the base station allocates sub-bands having an inner-cell interference power that is less than or equal to a threshold and consequently, the amplification of signals of sub-bands having an inner-cell interference power that exceeds the threshold can be prevented. Therefore, the relay station can be prevented from becoming a source of interference. Further, similar to the second embodiment, the reception quality of a mobile station whose reception quality is poor can be improved. Furthermore, a regenerating type relay station may be used.
  • the base station of the third embodiment calculates gain for each sub-band, based on the inner-cell interference power of each sub-band.
  • Configuration of the base station according to the sixth embodiment is, for example, as depicted in FIG. 18 .
  • FIG. 18 is a block diagram of the base station according to the sixth embodiment.
  • a base station 81 includes a first measurer 82 , the first table 32 , the determiner 14 , the first calculator 33 , the second table 34 , the second calculator 35 , the allocator 37 , a second measurer 83 , a third table 84 , and a third calculator 85 .
  • the first measurer 82 is similar to the measurer 12 of the third embodiment.
  • the second measurer 83 is similar to the second measurer 73 of the fifth embodiment.
  • the third table 84 stores thresholds used when sub-band gain is determined based on sub-band inner-cell interference power. Relationships between sub-band inner-cell interference power and gain may be, for example, preliminarily obtained by simulation using a computing device. In general, the greater the inner-cell interference power is, the smaller the gain is.
  • the third calculator 85 calculates gain for each sub-band, based on sub-band inner-cell interference power and a threshold in the third table 84 .
  • the third calculator 85 based on the gain for each sub-band, determines the sub-bands for which amplification can be performed at the relay station.
  • the third calculator 85 determines a sub-band for which the gain is greater than or equal to the threshold, to be a sub-band for which amplification can be performed.
  • the third calculator 85 for example, determines a sub-band for which the gain is less than the threshold to be a sub-band for which amplification cannot be performed at the relay station.
  • the threshold used for determining, at the third calculator 85 , whether amplification can be performed at the relay station may be, for example, preliminarily obtained by simulation using a computing device.
  • the threshold used for determining, at the third calculator 85 , whether to perform amplification at the relay station may be, for example, 0 dB.
  • the allocator 37 allocates as sub-bands for performing amplification, sub-bands of the number calculated by the second calculator 35 .
  • the allocator 37 allocates the sub-bands in a given order, such as in ascending order of gain, i.e., in descending order of interference power. Further, the allocator 37 , from among the sub-bands determined by the third calculator 85 as sub-bands for which amplification can be performed at the relay station, allocates as sub-bands for performing amplification, sub-bands of the number calculated by the second calculator 35 .
  • the allocator 37 allocates all of the sub-bands determined at the third calculator 85 as sub-bands for which amplification can be performed at the relay station, to be sub-bands for performing amplification.
  • the base station 81 broadcasts, via the switch 17 and the antenna 16 , the gain of each of the sub-bands that have been allocated by the allocator 37 .
  • Other aspects of the configuration of the base station 81 are similar to those of the third embodiment.
  • the antenna 16 , the switch 17 , the first measurer 82 , the first table 32 , the determiner 14 , and the first calculator 33 for example, operate as the calculator 3 in the first embodiment.
  • the second table 34 , the second calculator 35 , the allocator 37 , the second measurer 83 , the third table, 84 , and the third calculator 85 for example, operate as the allocator 4 in the first embodiment.
  • the configuration of the relay station in the sixth embodiment is similar to that in the third embodiment.
  • the receiver 42 receives and stores the gain for each sub-band and information indicating sub-bands allocated for performing amplification, which are broadcast by the base station.
  • the notifier 43 based on the gain for each sub-band and information indicating sub-bands allocated for performing amplification received by the receiver 42 , notifies the amplifier 28 of the information indicating sub-bands allocated for performing amplification.
  • the amplifier 28 amplifies by the gain broadcasted by the base station, analog input signals of the sub-bands notified by the notifier 43 .
  • FIG. 19 is a flowchart of the wireless communication method according to the sixth embodiment.
  • the base station when a process of allocating sub-bands for performing amplification begins at the base station, similar to steps S 31 to S 33 in the third embodiment, the base station, based on mobile station reception quality, calculates the number of or the rate of mobile stations requiring amplification (step S 61 ), and calculates the number of amplifying sub-bands k (where, k is whole number, 0 or greater) (step S 62 ).
  • the base station based on the inner-cell interference power of each sub-band, obtains gain for each of the sub-bands and calculates the number of sub-bands m (where, m is a whole number, 0 or greater) for which gain is greater than or equal to a threshold (step S 63 ).
  • the base station for example, allocates the sub-band for which gain is the greatest (step S 64 ).
  • the base station reduces k and m by 1 (step S 65 ), determines whether resulting value of k is 0 (step S 66 ), and determines whether the resulting value of m is 0 (step S 67 ). If the value of k is 0 (step S 66 : YES), there are no more amplifying sub-bands and consequently, the base station ends the allocation process. If the value of m is (step S 67 : YES), there are no more sub-bands for which gain is greater than or equal to the threshold and consequently, the base station ends the allocation process.
  • step S 63 may be before or after step S 62 , or before step S 61 .
  • the processes performed at the base station and relay station, respectively, after sub-bands have been allocated by the base station are similar to those of the third embodiment. However, the base station need not notify other base stations of information indicating the sub-bands that have been allocated for performing amplification.
  • the base station allocates sub-bands for which gain is greater than or equal to a threshold and consequently, the amplification of signals of sub-bands for which gain is less than the threshold, i.e., sub-bands having an inner-cell interference power that is greater than a given value, can be prevented. Therefore, the relay station can be prevented from becoming a source of interference. Further, similar to the second embodiment, the reception quality of a mobile station whose reception quality is poor can be improved. Furthermore, a regenerating type relay station may be used.
  • the base station of the third embodiment allocates for performing amplification, the frequency band used by mobile stations for which amplification is to be performed.
  • the configuration of the base station in the seventh embodiment is, for example, as depicted in FIG. 20 .
  • FIG. 20 is a block diagram of the base station according to the seventh embodiment.
  • a base station 91 includes the measurer 12 , a table 92 , the determiner 14 , an extractor 93 , a scheduler 94 , and the allocator 37 .
  • the table 92 is similar to the first table 32 in the third embodiment.
  • the extractor 93 extracts information indicating the mobile stations for which amplification has been determined necessary by the determiner 14 .
  • the scheduler 94 based on the mobile station information extracted by the extractor 93 , extracts information indicating wireless resources of the mobile stations.
  • the wireless resource information includes, for example, information indicating the frequency bands used by the mobile stations. Further, the scheduler 94 allocates wireless resources for the mobile stations.
  • the allocator 37 based on the information that is from the scheduler 94 and that indicates the wireless resources of the mobile stations for which amplification has been determined to be necessary, allocates for performing amplification, the frequency bands of the mobile stations.
  • the base station 91 broadcasts, via the switch 17 and the antenna 16 , information indicating the frequency bands allocated by the allocator 37 , for performing amplification.
  • the base station 91 may broadcast information concerning other wireless resources in addition to the information indicating the frequency bands allocated for performing amplification.
  • Other aspects of the configuration of the base station 91 are similar to those in the third embodiment.
  • the antenna 16 , the switch 17 , the measurer 12 , the table 92 , the determiner 14 , and the extractor 93 operate as the calculator 3 in the first embodiment.
  • the number of or the rate of mobile stations requiring amplification is not calculated.
  • the scheduler 94 and the allocator 37 for example, operate as the allocator 4 in the first embodiment.
  • the configuration of the relay station in the seventh embodiment is similar to that in the third embodiment.
  • the receiver 42 receives and stores information that is broadcasted by base station and that indicates the frequency bands allocated for performing amplification.
  • the receiver 42 may further receive and store information concerning other wireless resources, in addition to the frequency band information.
  • the notifier 43 based on the information that is received by the receiver 42 and that indicates the frequency bands allocated for performing amplification, notifies the amplifier 28 of the frequency bands allocated for performing amplification.
  • the amplifier 28 amplifies analog input signals of the frequency bands indicated by the notifier 43 to be allocated for performing amplification.
  • FIG. 21 is a flowchart of the wireless communication method according to the seventh embodiment.
  • the base station measures the reception quality such as the SIR of the mobile station, compares the reception quality and a preliminarily set threshold, and identifies mobile stations for which amplification is necessary (step S 71 ).
  • the base station identifies the wireless resources, such as the frequency band used, of the mobile stations for which amplification is necessary (step S 72 ).
  • the base station broadcasts information indicating the wireless resources used by the mobile stations for which amplification is necessary.
  • the relay station performs amplification with respect to the frequency band indicated by the base station (step S 73 ).
  • the base station allocates for performing amplification, the frequency bands of the mobile stations for which amplification is necessary and the relay station performs amplification with respect to the frequency bands used by the mobile stations for which amplification is necessary, consequently, the reception quality of a mobile station whose reception quality is poor can be improved. Furthermore, a regenerating type relay station may be used.
  • a relay station can prevented from becoming a source of interference.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Radio Relay Systems (AREA)
US13/344,754 2009-07-16 2012-01-06 Wireless communication system, base station, relay station, and wireless communication method Abandoned US20120108165A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2009/062916 WO2011007440A1 (ja) 2009-07-16 2009-07-16 無線通信システム、基地局、中継局および無線通信方法

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2009/062916 Continuation WO2011007440A1 (ja) 2009-07-16 2009-07-16 無線通信システム、基地局、中継局および無線通信方法

Publications (1)

Publication Number Publication Date
US20120108165A1 true US20120108165A1 (en) 2012-05-03

Family

ID=43449056

Family Applications (1)

Application Number Title Priority Date Filing Date
US13/344,754 Abandoned US20120108165A1 (en) 2009-07-16 2012-01-06 Wireless communication system, base station, relay station, and wireless communication method

Country Status (6)

Country Link
US (1) US20120108165A1 (ja)
EP (1) EP2456252B1 (ja)
JP (1) JP5408254B2 (ja)
KR (1) KR101335807B1 (ja)
CN (1) CN102474733B (ja)
WO (1) WO2011007440A1 (ja)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110051784A1 (en) * 2009-09-01 2011-03-03 Fujitsu Limited Relay method and relay apparatus
US20120213148A1 (en) * 2009-11-02 2012-08-23 Hitachi, Ltd. Wireless communication system having relay device, and method for selecting relay terminal
US20150215008A1 (en) * 2012-08-13 2015-07-30 Lg Electronics Inc. Method and apparatus for determining trigger condition for client cooperation in wireless communication system
CN109644342A (zh) * 2016-07-12 2019-04-16 无线电广播技术研究所有限公司 具有改进的传输和接收质量的移动无线电通信
US10827327B2 (en) * 2016-12-27 2020-11-03 Huawei Technoligies Co., Ltd. Relay transmission method and system, and related device
US11109388B2 (en) * 2018-10-16 2021-08-31 Shanghai Langbo Communication Technology Company Limited Method and device in user equipment and base station for wireless communication

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013184047A1 (en) * 2012-06-04 2013-12-12 Telefonaktiebolaget L M Ericsson (Publ) Resource allocation in a communication system with sub-band repeaters

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030214919A1 (en) * 2001-09-17 2003-11-20 Kilfoyle Daniel B. Method and system for a channel selective repeater with capacity enhancement in a spread-spectrum wireless network
US20050254442A1 (en) * 2004-05-13 2005-11-17 Widefi, Inc. Non-frequency translating repeater with detection and media access control
US20100067427A1 (en) * 2008-09-15 2010-03-18 Sharp Laboratories Of America, Inc. Systems and methods for inter relay interference coordination
US20100120397A1 (en) * 2008-11-13 2010-05-13 Muhammad Kazmi Creation and signalling of ue lists to support frequency selective repeater operation

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100645924B1 (ko) * 1999-07-20 2006-11-13 에스케이 텔레콤주식회사 이동 통신 단말기의 복수 대역 고주파 송·수신 장치
CN1290352C (zh) 2002-05-27 2006-12-13 株式会社Ntt都科摩 移动通信系统、发送站、接收站、中继站、通信路径决定方法
JP3809415B2 (ja) * 2002-12-26 2006-08-16 松下電器産業株式会社 送信電力決定装置および送信電力決定方法
EP2541803B1 (en) * 2005-03-14 2015-01-21 Panasonic Intellectual Property Corporation of America Wireless communication system based on regenerative and non-regenerative relay operation
JP2007251789A (ja) * 2006-03-17 2007-09-27 Ntt Docomo Inc 無線中継装置、無線中継方法
EP2075929A4 (en) * 2006-10-18 2014-01-15 Fujitsu Ltd WIRELESS BASE STATION, RELAY STATION, WIRELESS RELAY SYSTEM, AND WIRELESS RELAY METHOD

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030214919A1 (en) * 2001-09-17 2003-11-20 Kilfoyle Daniel B. Method and system for a channel selective repeater with capacity enhancement in a spread-spectrum wireless network
US20050254442A1 (en) * 2004-05-13 2005-11-17 Widefi, Inc. Non-frequency translating repeater with detection and media access control
US20100067427A1 (en) * 2008-09-15 2010-03-18 Sharp Laboratories Of America, Inc. Systems and methods for inter relay interference coordination
US20100120397A1 (en) * 2008-11-13 2010-05-13 Muhammad Kazmi Creation and signalling of ue lists to support frequency selective repeater operation

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110051784A1 (en) * 2009-09-01 2011-03-03 Fujitsu Limited Relay method and relay apparatus
US20120213148A1 (en) * 2009-11-02 2012-08-23 Hitachi, Ltd. Wireless communication system having relay device, and method for selecting relay terminal
US20150215008A1 (en) * 2012-08-13 2015-07-30 Lg Electronics Inc. Method and apparatus for determining trigger condition for client cooperation in wireless communication system
US9413436B2 (en) * 2012-08-13 2016-08-09 Lg Electronics Inc. Method and apparatus for determining trigger condition for client cooperation in wireless communication system
CN109644342A (zh) * 2016-07-12 2019-04-16 无线电广播技术研究所有限公司 具有改进的传输和接收质量的移动无线电通信
US20190349778A1 (en) * 2016-07-12 2019-11-14 Institut Fur Rundfunktechnik Gmbh Mobile radio communication with improved transmission and reception quality
US11252580B2 (en) * 2016-07-12 2022-02-15 Institut Fur Rundfunktechnik Gmbh Mobile radio communication with improved transmission and reception quality
US10827327B2 (en) * 2016-12-27 2020-11-03 Huawei Technoligies Co., Ltd. Relay transmission method and system, and related device
US11109388B2 (en) * 2018-10-16 2021-08-31 Shanghai Langbo Communication Technology Company Limited Method and device in user equipment and base station for wireless communication

Also Published As

Publication number Publication date
KR20130082437A (ko) 2013-07-19
EP2456252B1 (en) 2017-04-26
CN102474733A (zh) 2012-05-23
EP2456252A4 (en) 2012-12-19
CN102474733B (zh) 2015-08-05
JPWO2011007440A1 (ja) 2012-12-20
JP5408254B2 (ja) 2014-02-05
KR101335807B1 (ko) 2013-12-03
WO2011007440A1 (ja) 2011-01-20
EP2456252A1 (en) 2012-05-23

Similar Documents

Publication Publication Date Title
US20120108165A1 (en) Wireless communication system, base station, relay station, and wireless communication method
EP3162144B1 (en) Full duplex operation in a wireless communication network
US8301153B2 (en) Method of allocating resource for hierarchical cellular system and transmission frame for performing the method
US8971895B2 (en) Radio resource range setting device, radio resource range setting method, and recording medium
US20110136525A1 (en) Radio base station, relay apparatus and radio communication method
US8670778B2 (en) Dynamic sectors in a wireless communication system
KR100956756B1 (ko) 다중 홉 릴레이 시스템에서 중계국-단말 간 간섭 회피를 위한 주파수 재사용 장치 및 방법
US20160285537A1 (en) System and Method for Multi-Mode Multi-Spectrum Relays
Li Outage probability of cognitive radio networks with relay selection
KR20160014594A (ko) 무선 통신을 수행하는 디바이스에 자원을 할당하는 방법 및 기지국
US20130005329A1 (en) Relay device, relay device control method, and radio communication system
US20180115977A1 (en) Wireless communication system, base station device, wireless communication control device, and wireless communication control method
WO2011055841A1 (ja) 無線基地局及び通信制御方法
US8995904B2 (en) Base station, relay station, wireless communication system, and wireless communication method
US20180310295A1 (en) Wireless communication apparatus, wireless communication system, and processing method
US20100009693A1 (en) Base Station, Scheduling Method, And Wireless Terminal
WO2018160377A1 (en) Multi-source same-cell wireless distribution system (wds) with dynamic source adaptation
US11012177B2 (en) Message and rate based user grouping in non-orthogonal multiple access (NOMA) networks
CN114040421A (zh) 一种无线资源测量方法及装置
WO2017166164A1 (zh) 下行物理信道的发送方法、ue和基站
US20150319678A1 (en) Method and apparatus for anti-blocking hetnet deployment
US20140161106A1 (en) Method and apparatus for resource allocation based on buffer status information of neighboring cell
US10750379B2 (en) Base station device, method for operating same, and terminal device
US10405321B2 (en) Cell control device and operation method therefor
JP2012231267A (ja) 無線基地局及び通信制御方法

Legal Events

Date Code Title Description
AS Assignment

Owner name: FUJITSU LIMITED, JAPAN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:SAWAMOTO, TOSHIRO;REEL/FRAME:027491/0114

Effective date: 20111202

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION